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I tried to find a set of headers for my big block that I just installed in my 4x4 Blazer, with no luck. I talked with all the major manufacturers and they all gave me the same story...The 4x4's were not designed for big blocks and using the small block mounting location prevents header installation. Some guys have been able to make it work, but I was not able to. I ended up just reusing my cast iron manifolds for not. Sanderson does offer a performance cast iron manifold that looks like they may fit our tight applications.
I currently see three options.
1) Fabricating a new crossmember to give clearance which would also require some trimming of the frame (I shifted the engine forward 2" to help clear the firewall and the frame necks in, making the front header tubes very tight.
2) Having a shop fabricate a custom set of headers. I've already been told that they start at $1000 and go up from there since they are very time consuming.
3) Stick with cast iron manifolds.
For right now and since money doesn't grow on trees, option #3 is my choice!
Hope this helps,
Rick
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